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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '515547c7af3f9d85a10bde0250be1e10ecdeab1cf42d423d224fe1005c05a6bd' 
  AND token = 'S+bWh2tlUUcJovU1cB+9rEZk9J1AV8pGy6Zn5q3V06g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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