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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '150b8b6d796172d956ec9dfeb0a80f9be4c99e15b21f8be45c589eee4efea05a' 
  AND token = 'ftAfiXmHkQ1zp6bJp1FwBsRetpKNhu+46vFLGQYK9w8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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