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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '987e13db8b18f6deef32e75732cbbef75701136b4dd5a80a1c49f68d3bd5b441' 
  AND token = 'xifoj48tX5zfc86N/5wpKHvfeSnWaZVZbBDukT4/X3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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