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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea6b7afe5ada217e2dd0bb41d9fadfabe4c081d33cd34d13a074bee3801d9086' 
  AND token = 'gUsC0Pf6sOCoub/YLo3DmqHSd3fWWzgcOiZ5B2AwuXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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