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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb1f0bf1e7e56b24d739e8754717eedbcaf5ac0847f38e433c078c394549ba50' 
  AND token = 'uDdW8EbpN53HoFOS7p8CLK35aNzIsYNRHqDmtNoBcqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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