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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbda7220f54146c6d705eeaa49eef9338f4b85c6112819d1fd6399f90af1aac0' 
  AND token = 'ERZr5ie6LcgVDTko+FXJnrYBTKYR6TosP+XHoO8J5L8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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