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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '932682f76de2641a1396aa6b39b5de009aa527facdbab71ffb7ffb59202ae877' 
  AND token = 'JmYtuT52xrqeULi09vrinxJjqvV4199p6oWIh0B3eic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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