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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4db27fcd2b27564475aad4d6d4176e97792e67388715c6c8c97f95b3a0fd8729' 
  AND token = '9jv/avJ4Mdt56UWbQUT+VOGrodW6M/GRJigvluouem0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}