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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e482f0a2b9f3ae8695900ffdb88d1bc6b0f7d89062226b6f54bdb334b1fd4b2f' 
  AND token = 'aQGUiAYAynbuK7tXp4ANxBjk3zsn4npGsUb6ij9gL1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00069

JSON explain

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