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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85957d0b4b46f69fd0d71d0a0fa2f0e800aac14f328463aeb701bdb1c5ff01da' 
  AND token = 'VS6YpPSEe0Upsh2BFfUbpFN2g9q1WPCYSLjwaVkDOcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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