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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1b63d5ad84798f924e0305c09904ff55dfb1c3d108d2ff7800f59da725f8efd' 
  AND token = 'iuTth8zPZXwWcO2wRkGGfDam69EQOSZPXR7XUUy2NH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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