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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de8473742a4c6eaf7af653600ed9e7d0f8da431c28b3b63c4b947c5feac33bec' 
  AND token = '5ksVX/OPuel0JAz5XEVoEoIsROg5GrATMlzX5UTAGuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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