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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfc94f47c6f255aa029bedf25cc1a0293224cf8eadc31b92076f371edecb09aa' 
  AND token = '0JbClsCIdh0/tk3g60e6LjIgNnnyGGQXWif2s1TM2Tc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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