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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e719ad9727999e80224d5939d7c34ce14dc8136b4594d103dd61e31ad6b3eb20' 
  AND token = 'iKYuYYoOBOuI607wG5k9jozWwL29y6EgmHHjn5C7XKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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