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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '088899531dec44350fcf33da90991f6952805de598bf28ec987850ad8330d28f' 
  AND token = 'NlBT9b96i09J6aI3jKRCZs/2FsLhiJ5HsejB7SaG6/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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