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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a406c36c3ab8f1c15127c2191db1fd0df585b42ad2222b7286d5cd9bb964c0e' 
  AND token = 'L9nz1wMRP6qedYZC5OlQKfp8RfSCoLht73VtofzOcq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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