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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6168868232a4cf0762d4b67c905640b8abb85e14c7a270c897dd9901056ae0de' 
  AND token = 'fY0uFHFpgcuHE/54uk8XRmiOvwlVPo589p6dvuBCTJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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