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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b0fb0c61cce46c5a53d2cf7c70a93d04f4c1ccdadbb7ba3212f083ea12efa8b' 
  AND token = '+9oWpuSNF8A4MlzVYEM25l4LBLizp7sMABzN87qAso4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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