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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a32b6b7b4b9af69624523ef0f8da6ae19de33880d3d46de5b0ff2122c303cc6d' 
  AND token = 'rz5cXHEguvnANlEP7Z4YTz4Lr4M9z10vCq4eTlDPLUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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