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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8caa9fcf3525e2b6fc1cd52dfd3629d787b8264e166accf9092f8bbed043aea4' 
  AND token = '5kcLqMG5y0iw0c+aaO7E3MTP6B4jbh7jsU0d8Ed8kPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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