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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e439597a303fcef35b19b3f970b0d69f698f5e2ce2e0613331dee0122aff6b1' 
  AND token = 'koXKInkuN8C6R6SlI4Gp4Crz66Fg0yLO07vEa+wAgeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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