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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ae647c81c473abcb1f3675667e3bae07615ee86b4ca748fe61a106873bfc12a' 
  AND token = 'aQpwXNqheWrUgtDvKIv3M/6teqGQYG1bhnvAh8ZL2uc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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