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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e28261d9042a502a1f288425ab6ba001729c48818324ed4b7efc48d3ae9c822' 
  AND token = 'e7MhlK2OiRgWfPUtUUIete2IkhZ9RLm3xS4+iKAfmKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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