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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd5087bd5d0d696d62e3011e65eeb3f99e710cb19edc09cb1fda11107036d998' 
  AND token = 'JbX2E2Gxe2Fn+MxiyAngp2EAyHZjTnkvaTaQ0lSEGhw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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