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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39cde6bf0616b1a4d1b1778fcb60e8b02de52f8c1770c4d2d49bfca65c829bc6' 
  AND token = 'H1RA6llkymdq5aOMQckRSMVUcm7jGBQ3lePdxQsd9cM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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