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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb1c096e58fb528ca6047db320e18a332a18faef3a50bd08c2719e11a1d29680' 
  AND token = 'GvY2NnLpV48XXl4NUqCOjj7eUwj7QbvW8KMe2hJM8Cw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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