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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05499d9b2daa0e06a76d38bc47e5fde36941f280f14f9e484630ca1b8bfa6633' 
  AND token = '6RmYX/pYxfy+TUK/Z027EjyMf2E3ENTap4QtfS1K93E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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