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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19a4ae2b36a523adf5b431324f5fa6606211a38023a5ca8d108bd351ad870f1f' 
  AND token = 'L3Rsn9HbMtZ7dYhyx0Ct6bW2ZmkaXF2Zn5ENTC3R330=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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