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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd0cb453794cae4cf08a64fa9911f0e4af543ea6782d50a534982056b3ee3eac' 
  AND token = 'b8DLg+mVdmjc0KF/FsQ3JjIfD9qdM2qPeutJcaKW02g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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