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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c66da9e3d3b52057ce9e0cfa4c4f8798c673201ef39d36ce52ac55a1eb84f660' 
  AND token = 'f0/ue6tWi9WBKsW2pdw+GGCwp08+mVex8GutdGFcIg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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