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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9d52886fb0dcd901ad1ab9ff9851d3b141ce9738720eb388696b578bbf25fd5' 
  AND token = 'Rjz255YOeGZxeSsXwDsU+HSgIop+d0ydeJcr0Rx95R4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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