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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1cb493c2d1763091e2539c81685b4fd786f792cd2ab8f70d571aa67c8ce6dfb' 
  AND token = 'ZyL5dexLVTLo+nAj+beG5DPHXA+zw12cHUYwn3klETY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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