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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f3149f1dbbcb993d05b5b96108ea66674a5c5643d8b43b724b32a73395424c7' 
  AND token = 'p0tGqJeSlw/RELPz9wm7r748ll80s9rwEPSC2+bgx7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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