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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ae4895cfa85e6abcec888a1bb8ea343be05a2cf2d406682ea884fbb44f97e6d' 
  AND token = '9LBcSeB4PG4f/OJPiPy3hVE0iiZnNIG407fO9TiFJYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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