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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00f051e454ffae26cbd7592c2542f824be77e03d168b2796aec4c1d32d75e79a' 
  AND token = 'V7bpgbwLfwdfM5VZOvX7h6yJmitDK9ZY7WrLrN5CZ+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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