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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61eeaf0cd9894d0631a6ba1d90c5cce52a93163718861df05ecc1d4ba5231316' 
  AND token = '1kAKC6JhVLoX28AVHxWLaFR7i9kk/+oXnahiBsDQrno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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