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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6653cc78172c02375a1b60749e0ab28d635d0328acb1e831f946d8b48d4492e' 
  AND token = 'Du08rWj7S8FMnOpnTeQeP7yCFmkZPmy39Os/e7GVEsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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