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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4017faccf80a635a4539c8dd7ebe9c05ef5e7009cc4132abd3ed236a0bffc963' 
  AND token = 'JNJtQxrIwM4r5KB4JfOoyBtgC9CsptK69/aZYubUdCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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