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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e9b7fb3aac9e7f3481265c9a29106e78b509d039b97e43b34821bedeb517b7b' 
  AND token = 'zi3iFN3AAAKiVOHW2n/3xd/BgnYwTNbuY0lDcwWlZJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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