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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1aaa5971110dfadab5637c23fc2c8d970a317e8e0335e80504f0c2d9e77e6a13' 
  AND token = 'umIOzXg2Z7cbG7kJuGlCnqDw0SylH9vDHOx4WndpwSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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