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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7de91dafc52c3bbe522e32fbe3d5bd7e9328aac4e30ccbe89d223b5786203bf0' 
  AND token = 'KXN/68rYRQ7c4x2DwudPYt7Vn2iePB55lZcDBUFc1O8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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