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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd9b5b47c325089be2482f43d99dbb4e30ba63d402cc6fadd26e66fae13c1748' 
  AND token = 'vahYom3EJ4qDrAQh3T7vCl+buKmGObaJc57EX48bH+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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