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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd584f9c8e4e0262b2acf7e4be0c4641bfe6a02164278dec1d92437d07f914efc' 
  AND token = 'Jj9FJKqJogPqsA2IkXHNyuiKmQcSLcT5uWCwmUekO/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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