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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91d452fdeead5f27643eb9a425c5ca5612d73e33bec75bb0a15a67bd7c73239c' 
  AND token = '/qqlWa3D9nO+asGJql/MM/zGE1CGbpCkcLOivLOqWTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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