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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd087e1e64b3ff351417a584072be467b53d66a49bcd1800e7f19ebbfdb3e6c7' 
  AND token = '7DyUumkFQGi/wnUVBHdsyPdAbVw5m11DuUGVUIsABpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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