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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cee2388909c10e4e6882522098e942ba70aa5306f9478b14619e3c8ad55cae50' 
  AND token = 'lmOvlb/j67zV//OkPXE2mesP8iHbb98uDWBGQ7HlGTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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