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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3224976b610de9922743e55ca5671bc182b07b8ce7676a19d24c95fc7667aa52' 
  AND token = 'Mkgd4O4FjZbiZBpJkmE9S8YAxAq6SVn7/fVsUZvFETc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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