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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63329644af0636f8d05e19f1fd4e1025b9d8fbeacbc1b87629da1e3812d4791e' 
  AND token = '4tRzIM9q5017J5suQ5iFY4Tc3zLKLSxZKu4cbm6VSz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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