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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ca1fe010150e6c5d0ee77d1815e593d1399a307b551efa2043efd283aae46b9' 
  AND token = 'cDBGztzosF8g38072lNwTDQeCK2aycp/GQ1eSy9qEAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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