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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc57c3bfd2c6e568bf20c7a20cc153006dc0a51bf07e806e2de9b7d31bf4db61' 
  AND token = 'V+WOVg44QcrFB1dxPICGFFTHhGUaNdmER8opdkmwzvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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