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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cae7bba476695b88a61e25b523488fac8329e926a6379b3b843e9ecb1b4bb0b' 
  AND token = 'A8XoFP22uIihBe1DPVH9IjVE26sa/K3qDYPfo8vYh+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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