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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5fdc87e554013c8993d62d82df45cf1cdfd04f893fd5d81082fc7f349be74c2' 
  AND token = '/zKUERTT4vtErfwsm7qWBNMFPdBp072/1/+zXA9DbCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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