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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e657cc44138f1f0f9a3405f83e8c19febb895bd091770d9b5431f2ad59034e7' 
  AND token = '+r46zMHNy9woMDBNEWl5L0knYcsr2IdW1Z5NtAp3sGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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