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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf1a34addfe88c5ab3e17a123635da6f67fe1686521cff79c1c6bfd8f7338b12' 
  AND token = 'ctQHtA8bCs7ISH3qMttWq2+FaVQjlVFwexNhrQYHZ+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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