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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c630ff093db0fce6a0c9f1883b9fe9a7f21ab78a0deff5506c480089f60023e1' 
  AND token = '/XiBAb+2whq6hVzUdulvnpT2MlkkcTKlwGu5rTvrg2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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