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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8b1e02c8fc6cafd3b50a8bc0eff0c2760be655ba53ddd854eb6438277e0eda8' 
  AND token = 'h03C0KbeF8YTIlaeNFAY69tNgiejEYCtdOjqFiY6G4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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