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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b89e8f7fca94c1f6dbf684e4695db1767b57e66e3e54787b2cf74116a1dbe425' 
  AND token = 'dCblDYz/QsP+WbqLBlh/dEV9Mq1XQD5bjXPV9os94ZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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