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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15506ee0406a20dea6a225cffc4f18c1fc3ea8b8c6f3d46657d5edf8cfba1841' 
  AND token = 'jJw/QZMw4ZnmogHik2Y+pVZWvyjf11c7D4E+auJXMDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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