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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ee3a35600882500c319b479b3e376af3064ca5e9ae1b8d8fb207b316bf86f9e' 
  AND token = 'q2501ZAcz4TbXYnDjTegCRJiFEidZ5UgYyOp6Vz9yww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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