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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47ada3d21a791aaf8430e4d4b109e51f724f73c138982ef2fe9307238784d89e' 
  AND token = 'ju3DECnEJBq+N7heavwxHBy3APPgfksNN/cfjVF27No=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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