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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c4b0b1e8db4e36bf7511c2fac97200d6e459f40bb6b156eab38584222e40feb' 
  AND token = '+QelKsamDcZR5rk7DPAKiRiYwyMcVbtBb5KsV0DZhxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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