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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1fa1fd1fead7d4f98917b45c2a61b5d5ca41650ff297a44eb38627ef54758dc' 
  AND token = 'vZ6LH8D/UM5femwsM9NzFiNgZB7NznmxFOQw1zyaKI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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